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F^(-) ions make enamel on teeth harder b...

`F^(-)` ions make enamel on teeth harder by converting hydroxy apatite into

A

`Ca_(3)(PO_4)_(2)`

B

`Ca_(3)(PO_(4))_(2) CaFCl`

C

`3Ca_(3) (PO_4)_(2)CaF_(2)`

D

`Ca_(3)(PO_(4))_(2)CaO F_(2)`

Text Solution

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The correct Answer is:
C
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NARAYNA-ENVIRONMENTAL CHEMISTRY-EXCERCISE- I (H.W) (Water pollution)
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  2. Lakes containing excess of bacterial nutrients called

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  3. Beyoond which minimum concentration of F water becomes useless for dr...

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  4. Which of the following is a herbicide?

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  5. Which of the following is / are proper method to dispose sludge ? A)...

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  6. Which of the following metals is /are toxic and pollutants ? A) Cadm...

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  7. Domestic waste contains

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  8. DDT as pesticide is introduced by which of the following

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  9. DDT is

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  10. Sewagw containing organic waste when allowed into water bodies A)Helps...

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  11. Which one is not corect statement regarding minimizing enviromental po...

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  12. The acceptable level of lead in drinking water in ppm is A)501 B)250 C...

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  13. The maximum prescribed concentration of cadmium in drinking water in p...

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  14. The maximum allowed concentration in ppm of zinc in drinking water

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  15. F^(-) ions make enamel on teeth harder by converting hydroxy apatite i...

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  16. addition of phosphates to water ponds causes eutrophication due to

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  17. Presence of lead in water causes

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  18. DDT can act as

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  19. Carbamates are (A) Nerve toxins (B) Biodegradable (C) Pesticides (...

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  20. Major water pollutants are

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